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Article Dans Une Revue Physical Review Letters Année : 2011

Exploring the Thermodynamics of a Two-Dimensional Bose Gas

Résumé

Using in situ measurements on a quasi-two-dimensional, harmonically trapped 87Rb gas, we infer various equations of state for the equivalent homogeneous fluid. From the dependence of the total atom number and the central density of our clouds with chemical potential and temperature, we obtain the equations of state for the pressure and the phase-space density. Then, using the approximate scale invariance of this 2D system, we determine the entropy per particle and find very low values (below 0.1kB) in the strongly degenerate regime. This shows that this gas can constitute an efficient coolant for other quantum fluids. We also explain how to disentangle the various contributions (kinetic, potential, interaction) to the energy of the trapped gas using a time-of-flight method, from which we infer the reduction of density fluctuations in a nonfully coherent cloud.

Dates et versions

hal-03740930 , version 1 (30-07-2022)

Identifiants

Citer

Tarik Yefsah, Rémi Desbuquois, Lauriane Chomaz, Kenneth J. Günter, Jean Dalibard. Exploring the Thermodynamics of a Two-Dimensional Bose Gas. Physical Review Letters, 2011, 107 (13), pp.130401. ⟨10.1103/PhysRevLett.107.130401⟩. ⟨hal-03740930⟩
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